Which of the following statements about eukaryotic RNA is true?
A) Introns are not transcribed from DNA to RNA.
B) Exons are spliced together.
C) A small cap of extra nucleotides is added to both ends of the RNA.
D) The modified RNA molecule is transported into the nucleus.
Answer: B
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When two or more genes from the same genome have nucleotide sequences so alike that they most probably arose from gene duplication those genes are called ________.
A. homologs B. duologs C. orthologs D. paralogs
The term amphipathic refers to those molecules that are
A) hydrophilic. B) hydrophobic. C) charged at both ends but with opposite charges. D) nonpolar at both ends. E) charged at one end and nonpolar at the other.
Ice floats in liquid water because
a. ice forms hydrogen bonds with the surface of liquid water. b. ice forms hydrogen bonds but liquid water does not. c. the hydrogen bonds of liquid water are fixed in place. d. liquid water forms hydrogen bonds but ice does not. e. the distance between water molecules is maximized due to the hydrogen bonds which are fixed in place.
Individuals with androgen insensitivity are abnormal because
A. their ovarian ducts do not develop. B. their testes do not produce testosterone. C. they have no Müllerian ducts. D. they are missing a receptor protein for testosterone. E. they have two copies of the SRY gene.